Or to put it differently: On mobile the skrollr-body element is moved using CSS transforms. 依据CSS规范，你不能使用 position:fixed或者background-attachment:fixed 在使用css 变换元素里面。(http://meyerweb.com/eric/thoughts/2011/09/12/un-fixing-fixed-elements-with-css-transforms/). 这就是为什么这些元素需要放在skrollr-body外面 。
Being only able to define key frames in absolute values is simply insufficient for some cases. For example, if you don't know exactly where an element will be in the document. That's why there are two modes for key frames, namely absolute andrelative mode.
absolute mode (or document mode)
The key frames are defined as absolute values describing how much the document has been scrolled down.
The syntax is data-[offset]-[anchor], where offset can be any integer (0 is default) and anchor can be either start(default) or end. Either offset or anchor can be omitted in some situations. Here are some examples of key frames and their meaning.
data-0 = data-start = data-0-start: When the scroll top is 0.
data-100 = data-100-start: When the scroll top is 100.
data--100 = data--100-start: When the scroll top is -100 (sounds like nonsense, but keep in mind that interpolation will be relative to this point).
data-end = data-0-end: When offset is 0, but counting from the bottom of the document instead of from the top. In short: when you reach the bottom of the page.
data-100-end: 100px before we reach the bottom.
data--100-end: 100px after we reach the bottom (again, it's up to you whether you need it).
relative mode (or viewport mode)
Instead of defining key frames relative to the document (i.e. absolute), we are able to define them depending on the position of any element in relation to the viewport.
The syntax is data-[offset]-(viewport-anchor)-[element-anchor], where offset can again be any integer and defaults to 0. Both viewport-anchor (mandatory) and element-anchor (optional) can be one of top, center or bottom. If element-anchoris omitted, the value of viewport-anchor will be taken (just like with background-position). Here are some examples of key frames and their meaning.
data-top = data-0-top = data-top-top = data-0-top-top: When the element's top is aligned with the top of the viewport.
data-100-top = data-100-top-top: When the element's top is 100px above the top of the viewport.
data--100-top = data--100-top-top: When the element's top is 100px below the top of the viewport.
data-top-bottom= data-0-top-bottom: When the bottom of the element is at the top of the viewport (it's just not visible).
data-center-center = data-0-center-center: When the element is at the center of the viewport.
data-bottom-center = data-0-bottom-center: When the element's center is at the bottom of the viewport, thus the upper half of the element is visible.
By default the keyframes are triggered by the position of the element where the keyframes are described. However there are times when the position of a second element should trigger the first element's keyframes. The data-anchor-target attribute can be used in these cases. The data-anchor-target attribute accepts any CSS selector and the position of the first element on the page matching the selector will be used to trigger keyframes on the element where the attribute is defined. data-anchor-target requires IE 8 or greater.
Examples: data-anchor-target="#foo"> will have it's keyframes tiggered by the position of the #foo element. Any CSS selector can be used, i.e data-anchor-target=".bar:not(.bacon) ~ span > a[href]"
Note: If you need to support IE 7, then you may only use IDs as anchor-targets, i.e. #foo. The IE plugin maps querySelectorto getElementById.
Here's an infographic for better understanding of anchors (click to open PDF):
Important: All those values will be calculated up-front and transformed to absolute mode. So if either the element's box height changes (height, padding, border) or the elements position within the document, you probably need to call refresh()(see documentation in JavaScript section below). Window resizing is handled by skrollr.
Percentage offsets
All offsets shown above are given in absolute pixel values, e.g. data-300 for 300px from the top or data-13-top-bottom for a13px offset to the top-bottom anchor. As of skrollr 0.6.13 you can also have offsets as percentages of the viewport by appending a p to the number. For example data-75p for when you scrolled down 75% of the viewport or data-10p-centerto have a 10% offset from the center anchor.
Hash navigation
Check out the skrollr-menu plugin.
Working with constants
I was lying to you. The syntax for absolute mode is not data-[offset]-[anchor] and for relative mode it's not data-[offset]-(viewport-anchor)-[element-anchor]. In both cases, offset can be preceded by a constant which can be passed to the initmethod. The name of the constant needs to be preceded with an underscore.
Starting with skrollr 0.6.19 the word "constants" doesn't quite fit anymore, but who cares.
You can now use functions and percentages as constants. They are automatically evaluated when the window is resized or if you call refresh.
skrollr.init({
constants: {
foo:function() {
//Note: you can access the skrollr instance with `this` for things like `this.relativeToAbsolute`returnMath.random() *100;//trolololol
},
vh:'100p'
}
});
CSS classes
skrollr will add a skrollr class to the HTML element when calling init and will remove a no-skrollr class if present. Additionally, it will add a skrollr-desktop or skrollr-mobile class depending on which it detects. This allows fallback CSS rules to create a good user experience on unsupported devices or when JavaScript or skrollr are disabled.
All elements under skrollr's control (elements with appropriate data-attributes) will get the skrollable class. In addition, we add either the skrollable-before, skrollable-betweenorskrollable-after class, depending on whether the current scroll position is before, between or after the first/last (smallest/largest) keyframe of an element.
Animating attributes
Starting with skrollr 0.6.24 you can also animate attribute and not just style properties. This is especially a big thing because in the SVG world many properties are implemented as attributes and not in CSS. Animating an attribute couldn't be simplier, just prefix the property with an @ symbol!
Note: as always, skrollr doesn't do any magic. It doesn't understand what a polygon or points are. It's only interpolating numbers, that's it. So make sure you have the same number of numbers in your keyframes (8 in this case).
One could expect left to have a value of 25% at keyframe 200. That is not the case. By design, skrollr only interpolates values between key frames which are direct neighbors. What actually happens is that skrollr internally fills out all holes once from left and then from right. So the above is equivalent to
The reason why skrollr is so lightweight and powerful is because it literally interpolates every number it can find. If you want to prevent some side effect, you can suppress interpolation for a specific value by prepending an exclamation point.
Note: The values for both keyframes (if they contain a number) need to be prefixed if you want to avoid skrollr throwing an exception at you!
Limitations
There are some limitations of skrollr you should be aware of.
All numeric values have to have the same unit, even 0 needs a unit. It's not possible to animate from 5% to 100px. skrollr won't complain, but results are undefined.
Animations between values which are composed of multiple numeric values like margin:0 0 0 0; are only possible for the same number of values. margin:0px 0px 0px 0px; to margin:0px 100px 50px 3px; is fine, but not margin:10px; tomargin:5px 10px;.
Animations between CSS transforms only work when they use the same functions in same order. From rotate(0deg) scale(1) to rotate(1000deg) scale(5) is fine.
Color animations don't support named values like "red" or hex values like "#ff0000". Instead, you have to use rgb(),rgba(), hsl() and hsla(). Don't worry, there's a skrollr plugin for IE < 9 to support hsl() (without "a"!) and to fall rgba back to rgb.
Color animations only work for same color functions. hsl() to hsl() or hsla() is fine, but not rgb() to hsl(). Which makes sense, because animating from the same colors in rgb space and in hsl space results in different animations (hsl gives you the nice rainbow stuff).
But feel free to send in a pull request to fix any of them. Just keep in mind that keeping skrollr as lightweight as possible has high priority.
JavaScript
On the JavaScript part there's not much to do (you can, if you want to!). So if you only know CSS and HTML, perfect.
skrollr.init([options])
All there is to do is to call skrollr.init([options]); which returns an instance of the singleton skrollr class. Subsequent calls to init() will just return the same skrollr instance again.
Possible options for init() are
smoothScrolling=true
Smooth scrolling smoothens your animations. When you scroll down 50 pixels, the animations will transition instead of jumping to the new position.
The global setting can be overridden per element by setting data-smooth-scrolling to on or off.
smoothScrollingDuration=200
The number of milliseconds the animations run after the scroll position changed the last time.
constants={}
An object containing integers as values. The keys can contain [a-z0-9_]. They do not need a leading underscore.
Example: data-_myconst-200 and skrollr.init({constants: {myconst: 300}}) result in data-500.
scale=1
By default, skrollr uses the largest key frame and makes document height + viewport height this high, thus the max possible scroll top offset. If your animation runs too fast or too slow, just adjust the scale value.
scale only affects keyframes in absolute mode.
When forceHeight is set to false, scale is ignored.
scale affects constants as well.
scale does only affect key frames in absolute mode, e.g. data-500 but not data-top.
forceHeight=true
true: Make sure the document is high enough that all key frames fit inside. Example: You use data-1000, but the content only makes the document 500px high. skrollr will ensure that you can scroll down the whole 1000px. Or if you use relative mode, e.g. data-top-bottom, skrollr will make sure the bottom of the element can actually reach the top of the viewport.
false: Don't manipulate the document and just keep the natural scrollbar.
mobileCheck=function() {...}
This option allows you to pass a function to skrollr overwriting the check for mobile devices. The function should return truewhen mobile scrolling should be used and false if not.
The amount of deceleration for momentum scrolling on mobile devices. This options tells skrollr how fast or slow you want the scrolling to stop after the user lifted his finger.
Set it to 1 to disable momentum scrolling.
skrollrBody='skrollr-body'
This option allows you to override the default id-selector used for supporting mobile browsers. It might come in handy when the element in question already has a assigned id or if you would like to define more then one skrollrBody depending on preceding JavaScript-logic.
edgeStrategy='set'
This option specifies how to handle animations when the scroll position is outside the range on the keyframes (i.e. before the first or after the last keyframe).
One of three options are possible
set(default): When before/after the first/last keyframe, apply the styles of the first/last keyframe to the element.
ease: Same as set, but the values will be transformed using the given easing function.
reset: When before/after the first/last keyframe, apply the styles which the element had before skrollr did anything. This means resetting the class attribute as well as removing all styles which have been applied to the style property. This means the element won't have any skrollable-* CSS classes.
and the following easing function which always returns 0.5 (I know it's pointless, but it's just an example. A real world example would be an easing function that represents a curve and starts somewhere between 0 and 1, but not at 1)
function(p) {
return0.5;
}
and imagine the scrollbar is at 237, which is below the first keyframe which is at 1000.
set will result in which is plaindata-1000.
ease will result in which is 0.5 * data-1000.
reset will result in which is what the element originally had. Note how top is missing.
beforerender
A listener function that gets called each time right before we render everything. The function will be passed an object with the following properties:
{
curTop:10, //the current scroll top offset
lastTop:0, //the top value of last time
maxTop:100, //the max value you can scroll to. curTop/maxTop will give you the current progress.
direction:'down'//either up or down
}
Returning false will prevent rendering.
render
A listener function that gets called right after we finished rendering everything. The function will be passed with the same parameters as beforerender.
Example
skrollr.init({
render:function(data) {
//Log the current scroll position.console.log(data.curTop);
}
});
keyframe
Experimental
In order to receive keyframe events from an element, add the data-emit-events attribute to the element. The keyframe function will be called with three arguments
The element that passed the keyframe.
The name of the keyframe, camel-cased (see example).
The direction the user is scrolling.
Example:
<divdata-500="..."data-top-bottom="..."data-_offset-center="..."data-emit-events
>
Some content
div>
skrollr.init({
keyframe:function(element, name, direction) {
//name will be one of data500, dataTopBottom, data_offsetCenter
}
});
Note: this is experimental, expect the API to change! Originally I wanted to emit the events right on the element, so you could do this
//Wouldn't this be nice?document.querySelector('#foo').addEventListener('skrollr.dataTopBottom.up', function() {
//#foo just passed the data-top-bottom keyframe while scrolling up
}, false)
but IE.
easing
An object defining new easing functions or overwriting existing ones. Easing functions get just one argument, which is a value between 0 and 1 (the percentage of how much of the animation is done). The function should return a value between 0 and 1 as well, but for some easings a value less than 0 or greater than 1 is just fine.
An easing function basically transforms the timeline for an animation. When the animation should be 50% done, you can transform it to be 90% done or whatever your function does.
Example:
skrollr.init({
easing: {
//This easing will sure drive you crazy
wtf:Math.random,
inverted:function(p) {
return1- p;
}
}
});
You can now use the easing functions like any other.
skrollr ships with some built in functions:
linear: The default. Doesn't need to be specified.
quadratic: To the power of two. So 50% looks like 25%.
cubic: To the power of three. So 50% looks like 12.5%
begin/end: They always return 0 or 1 respectively. No animation.
swing: Slow at the beginning and accelerates at the end. So 25% -> 14.6%, 50% -> 50%, 75% -> 85.3%
sqrt: Square root. Starts fast, slows down at the end.
outCubic
bounce: Bounces like a ball. See https://www.desmos.com/calculator/tbr20s8vd2 for a graphical representation.
Custom easing
Use this generator
Insert the given polynomial coeficients instead of t, t2, t3, t4 and t5
Returns the skrollr instance if init() has been called before or undefined.
Public API
Calling init() returns an instance of skrollr which exposes a public api.
refresh([elements])
Reparses all given elements. You can pass a single element or an array-like element (Array, NodeList or jQuery object)
Useful when
Elements in relative mode change and need to be updated.
Data-attributes are manipulated dynamically.
New elements are added to the DOM and should be controlled by skrollr.
When no elements are given, all elements in the document will be parsed again. In fact, when calling skrollr.init() skrollr uses refresh() without parameters internally.
Time consuming operations, should not be called on every rendering.
Returns an integer which represents the absolute scroll position which correlates to the relative anchor.
element must be a DOM element.
viewportAnchor and elementAnchor must be one of top, center or bottom
Example:
var offset =s.relativeToAbsolute(document.getElementById('foo'), 'top', 'bottom');
//offset contains the scroll position at which #foo's bottom is at the top of the viewport.//If you now use setScrollTop(offset) or animateTo(offset) #foo's bottom will be perfectly aligned with the top of the viewport. Yay.
getScrollTop()
Returns the current scroll offset in pixels. Normalizes different browser quirks and handles mobile scrolling.
getMaxScrollTop()
Returns the number of pixels that can be scrolled down in total. If forceHeight is true, that's usually the largest keyframe. Otherwise it's the height of the document minus the viewport height.
setScrollTop(top[, force = false])
Sets the top offset using window.scrollTo(0, top) on desktop or updating the internal state in case of mobile scrolling.
When force is set to true, skrollr will jump to the new position without any kind of transition. By default, the globalsmoothScrolling setting applies.
isMobile()
Returns if skrollr runs in mobile mode (see also mobileCheck option).
animateTo(top[, options])
Animates the scroll position from current position to top. Possible options are
duration
How long the animation should run in milliseconds. The default is 1000 or one second.
easing
The name of an easing function. The same functions can be used as for property animations. Default is linear .
done
A function to be called after the animation finished. When you pass a top value, which is the same as the current, then the function will be called immediately. The function gets a boolean argument interrupted which indicates if the animation was interrupted by stopAnimateTo or finished to the end.
stopAnimateTo()
Stops the animation and calls the done callback passing true as interrupted arguments.
isAnimatingTo()
Returns if an animation caused by animateTo is running.
on(name, fn)
Set a listener function for one of the events described in the options section (beforerender, render, keyframe). Only one listener can be attached at a given time. This method overwrites the current listener, if any.
off(name)
Removes the listener for the given event.
destroy()
Destroys skrollr. All class and style attributes will be set to the values they had before.
GetUrlParam:function GetUrlParam(param){
var reg = new RegExp("(^|&)"+ param +"=([^&]*)(&|$)");
var r = window.location.search.substr(1).match(reg);
if(r!=null
==================================================
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Model name:模板名字，自
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在Java程序中，如何使用处理JSON，现在有很多工具可以处理，比较流行常用的是google的gson和alibaba的fastjson，具体使用如下：
1、读取json然后处理
class ReadJSON
{
public static void main(String[] args)
